Improvement in dust-bands for watches



o. HOYT. DUST-BAND FOR WATCHES.

No. 195,711. Patented on.2,1a77.

Nv FETHIS, PHOTO-LITHOGRAFMER, WASHINGTON, DC.

UNITED STATES PATENT QFFICE.

OTIS HOYT, OF SPRINGFIELD, ILLINOIS.

IMPROVEMENT IN DUST-BANDS FOR WATCHES.

Specification forming part of Letters Patent No. 195,711, dated October2, 1877; application filed July 24, 1877.

To all whom it may concern:

Be it known that I, O'ris HOYT, of the city of Springfield, Sangamoncounty, State of Illinois, have invented a new and useful Improvement inDust-Bands for Watches, of which the following is a full description,reference being had to the accompanying drawings, in which- Figure 1 isa top view; Fig. 2, an elevation; Fig. 3, a top view of thebarrel-bridge; Fig. 4, an elevation of the dustband detached; Fig. 5, across-section of the dust-band; Fig. 6, a top or plan view of thedust-band; Fig. 7, a plan view of the top plate with the bridge removed5 and Fig. 8, a broken cross-section on line :20 a; of Fig. 2. Figs. 3,4, 5, and S are en larged.

The object of this invention is to improve the construction of bands forexcluding dust from watches, and their connection with the movement andwith the barrel-bridge.

Its nature consists in providing a solid dust band or ring with anupward-projecting lip that passes up over, or partly over, the outeredge of the bridge, so as to form a lap-joint therewith; in recessingthe bridge or setting it back from the circumferential line of the topplate, so that the projection from the dustband when in place will fillthe receding, come out even with, and fill or complete the circle of thetop plate; in providing notches or small recesses at the corners of thebarrelopening in the top plate to support or partly support the ends ofthe dust-band projection; in forming the upward projection of the dustband in the arc of a smaller circle than that of the band; and in theseveral combinations of parts hereinafter more fully described.

In the drawings, (1. represents the top plate b, the pillar-plate; b, anannular shoulder on the pillar-plate; c, the dust band or ring d, thebarrel-bridge; c, the recess or reduced portion of the outer edge of thebridge; f, the upward projection or lip of the dustband; g, the notchesor short recesses at the corners of the barrel-opening of the top plate;and h, barrel-opening in top plate.

The plates to b are made of the forms as shown, and the ring portion ofthe dust-band is made in the usual form of a solid ring, and has itsupper edge beveled off, as shown, and

for ease of application it should be slightly beveled out on the inside,or its extreme upper edge slightly crowned over inward to make a closefit against the edge of the top plate.

The projection or lip f is made longer than the width of thebarrel-opening, so as to fit into the notches g of the top plate, andgive it a firm support at those points, and also to give it theoperation of an arch to prevent its being crowded or sprung inwardagainst the mainspringbarrel. This lip f is also made high or wideenough to pass over or partly over the outer edge of the recessedportion ofthe bridge, so as to form a lap-joint therewith, and to giveit an additional support. For coarser or cheap watches the lapping overthe bridge may be used as a sufficient support without the notches g,-but these notches or recesses not only give a support to the ends of thelip, but they also enable me to form lap-joints at those points. Theiruse is, therefore, preferred.

The lip fis made in the arc of a smaller circle than the part a, so asto fit into the recess 6 and the notches y when used. It is mostconveniently made by spinning or stamping a secondary ring of thedesired width or height, and then cutting way the unused portion,leaving a lip, as shown at Fig. 4; but it may be formed in any othersuitable manner.

The lower edge of the band 0 may be made to abut against thepillar-plate, but it will be preferable to form a shoulder, b, on saidplate, so as to form a lap-joint at this line of contact instead of anabutting one.

The operation will be obvious from the construction.

By making the lip f on the arc of a smaller circle, as shown, recessingor receding the bridge and beveling ofl' its upper edge uniformly withthe edge of the bridge, it does not interfere with the insertion into anordinary watch-case of a movement having this dust excluding deviceapplied to it; and by bringing the lip out flush with thecircumferential line of the top plate the form and appear ance of thetop of the movement are preserved.

I do not claim, broadly, the application of a lip to a dustband; but

\Vhat I claim as new, and desire to secure by Letters Patent, is

1. The dust band or ring 0, having a projection or lip, f, made in thearc of a smaller circle, substantially as specified.

2. The bridge d, having a recess, 6, in its outer edge, substantially asand for the purpose described.

3. The combination of the band cand lip f with the bridge (I and topplate a, for forming a 1ap-j0int over the outer edge of the bridge,substantially as set forth.

4. The notches g, in combination with the.

lip f, band c, bridge d, and plate a, for sup- OTIS HOYT.

Witnesses WV. B. MILLER, 0. A. WATSON.

